Pregnancy Due Date Ranges

This table attempts to estimate your probability of going into labor on different individual days based on your estimated due date. If you don't know your due date, or just want a handy daily page to tell you where you're at, use the pregnancy calendar.

It's based on the idea that the average pregnancy lasts 40 weeks with a standard deviation of about 10 days. This means you're more likely to go into labor on one of the days close to your due date. For instance, about half of all babies are born within a week of their date. Scroll to the bottom of this page if you want to know more about where I got these numbers.

The following dates are based on an estimated due date of
December 20th, 2014.

Change due date:

Month

Day

Year

Date

Progress

Overall probability ofspontaneous labor

Current probability ofspontaneous labor

probability of a pregnant woman at this stage going into labor

On this date

By this date

On this date

By this date

On this date

Within 3 days

Within 5 days

Within 7 days

Saturday November 15th, 2014

35W, 0D

0.01%

0.02%

-%

-%

-%

0.1%

0.1%

0.2%

Sunday November 16th, 2014

35W, 1D

0.01%

0.03%

-%

-%

-%

0.1%

0.2%

0.3%

Monday November 17th, 2014

35W, 2D

0.02%

0.05%

-%

-%

-%

0.1%

0.2%

0.4%

Tuesday November 18th, 2014

35W, 3D

0.02%

0.07%

-%

-%

-%

0.1%

0.3%

0.6%

Wednesday November 19th, 2014

35W, 4D

0.03%

0.1%

-%

-%

-%

0.2%

0.4%

0.7%

Thursday November 20th, 2014

35W, 5D

0.04%

0.13%

-%

-%

-%

0.2%

0.5%

0.9%

Friday November 21st, 2014

35W, 6D

0.06%

0.19%

-%

-%

0.1%

0.3%

0.6%

1.2%

Saturday November 22nd, 2014

36W, 0D

0.08%

0.26%

-%

-%

0.1%

0.4%

0.8%

1.5%

Sunday November 23rd, 2014

36W, 1D

0.1%

0.35%

-%

-%

0.1%

0.5%

1%

1.9%

Monday November 24th, 2014

36W, 2D

0.14%

0.47%

-%

-%

0.1%

0.6%

1.3%

2.4%

Tuesday November 25th, 2014

36W, 3D

0.18%

0.62%

-%

-%

0.2%

0.8%

1.7%

3%

Wednesday November 26th, 2014

36W, 4D

0.22%

0.82%

-%

-%

0.2%

1%

2.1%

3.7%

Thursday November 27th, 2014

36W, 5D

0.28%

1.07%

-%

-%

0.3%

1.2%

2.5%

4.5%

Friday November 28th, 2014

36W, 6D

0.35%

1.39%

-%

-%

0.4%

1.5%

3.1%

5.4%

Saturday November 29th, 2014

37W, 0D

0.44%

1.79%

-%

-%

0.4%

1.8%

3.8%

6.4%

Sunday November 30th, 2014

37W, 1D

0.54%

2.28%

-%

-%

0.6%

2.2%

4.5%

7.6%

Monday December 1st, 2014

37W, 2D

0.66%

2.87%

-%

-%

0.7%

2.7%

5.4%

8.9%

Tuesday December 2nd, 2014

37W, 3D

0.79%

3.59%

-%

-%

0.8%

3.2%

6.3%

10.4%

Wednesday December 3rd, 2014

37W, 4D

0.94%

4.46%

-%

-%

1%

3.8%

7.4%

11.9%

Thursday December 4th, 2014

37W, 5D

1.11%

5.48%

-%

-%

1.2%

4.4%

8.6%

13.7%

Friday December 5th, 2014

37W, 6D

1.3%

6.68%

-%

-%

1.4%

5.2%

9.8%

15.5%

Saturday December 6th, 2014

38W, 0D

1.5%

8.08%

-%

-%

1.6%

6%

11.2%

17.5%

Sunday December 7th, 2014

38W, 1D

1.71%

9.68%

-%

-%

1.9%

6.9%

12.7%

19.7%

Monday December 8th, 2014

38W, 2D

1.94%

11.51%

-%

-%

2.2%

7.8%

14.3%

21.9%

Tuesday December 9th, 2014

38W, 3D

2.18%

13.57%

-%

-%

2.5%

8.8%

16%

24.2%

Wednesday December 10th, 2014

38W, 4D

2.42%

15.87%

-%

-%

2.9%

9.9%

17.8%

26.6%

Thursday December 11th, 2014

38W, 5D

2.66%

18.41%

-%

-%

3.3%

11.1%

19.7%

29%

Friday December 12th, 2014

38W, 6D

2.9%

21.19%

-%

-%

3.7%

12.3%

21.6%

31.5%

Saturday December 13th, 2014

39W, 0D

3.12%

24.2%

-%

-%

4.1%

13.5%

23.6%

34%

Sunday December 14th, 2014

39W, 1D

3.33%

27.43%

-%

-%

4.6%

14.9%

25.6%

36.6%

Monday December 15th, 2014

39W, 2D

3.52%

30.85%

-%

-%

5.1%

16.2%

27.7%

39.2%

Tuesday December 16th, 2014

39W, 3D

3.68%

34.46%

-%

-%

5.6%

17.6%

29.8%

41.7%

Wednesday December 17th, 2014

39W, 4D

3.81%

38.21%

-%

-%

6.2%

19.1%

31.9%

44.2%

Thursday December 18th, 2014

39W, 5D

3.91%

42.07%

-%

-%

6.7%

20.6%

34%

46.7%

Friday December 19th, 2014

39W, 6D

3.97%

46.02%

-%

-%

7.4%

22.1%

36.2%

49.2%

Saturday December 20th, 2014

40W, 0D

3.99%

50%

-%

-%

8%

23.6%

38.3%

51.6%

Sunday December 21st, 2014

40W, 1D

3.97%

53.98%

-%

-%

8.6%

25.1%

40.4%

54%

Monday December 22nd, 2014

40W, 2D

3.91%

57.93%

-%

-%

9.3%

26.7%

42.5%

56.2%

Tuesday December 23rd, 2014

40W, 3D

3.81%

61.79%

-%

-%

10%

28.2%

44.5%

58.5%

Wednesday December 24th, 2014

40W, 4D

3.68%

65.54%

-%

-%

10.7%

29.8%

46.6%

60.6%

Thursday December 25th, 2014

40W, 5D

3.52%

69.15%

-%

-%

11.4%

31.3%

48.6%

62.7%

Friday December 26th, 2014

40W, 6D

3.33%

72.57%

-%

-%

12.1%

32.9%

50.5%

64.7%

Saturday December 27th, 2014

41W, 0D

3.12%

75.8%

-%

-%

12.9%

34.4%

52.4%

66.6%

Sunday December 28th, 2014

41W, 1D

2.9%

78.81%

-%

-%

13.7%

36%

54.3%

68.5%

Monday December 29th, 2014

41W, 2D

2.66%

81.59%

-%

-%

14.4%

37.5%

56.1%

70.2%

Tuesday December 30th, 2014

41W, 3D

2.42%

84.13%

-%

-%

15.2%

39%

57.9%

71.9%

Wednesday December 31st, 2014

41W, 4D

2.18%

86.43%

-%

-%

16.1%

40.5%

59.6%

73.5%

Thursday January 1st, 2015

41W, 5D

1.94%

88.49%

-%

-%

16.9%

42%

61.3%

75.1%

Friday January 2nd, 2015

41W, 6D

1.71%

90.32%

-%

-%

17.7%

43.4%

62.9%

76.4%

Saturday January 3rd, 2015

42W, 0D

1.5%

91.92%

-%

-%

18.6%

44.8%

64.5%

77.8%

Sunday January 4th, 2015

42W, 1D

1.3%

93.32%

-%

-%

19.5%

46.3%

65.9%

79.2%

Monday January 5th, 2015

42W, 2D

1.11%

94.52%

-%

-%

20.3%

47.6%

67.3%

80.5%

Tuesday January 6th, 2015

42W, 3D

0.94%

95.54%

-%

-%

21.1%

48.9%

68.8%

81.6%

Wednesday January 7th, 2015

42W, 4D

0.79%

96.41%

-%

-%

22%

50.1%

70.2%

82.7%

Thursday January 8th, 2015

42W, 5D

0.66%

97.13%

-%

-%

23%

51.6%

71.4%

83.6%

Friday January 9th, 2015

42W, 6D

0.54%

97.72%

-%

-%

23.7%

53.1%

72.8%

84.6%

Saturday January 10th, 2015

43W, 0D

0.44%

98.21%

-%

-%

24.6%

54.2%

73.7%

85.5%

Sunday January 11th, 2015

43W, 1D

0.35%

98.61%

-%

-%

25.2%

55.4%

74.8%

86.3%

Monday January 12th, 2015

43W, 2D

0.28%

98.93%

-%

-%

26.2%

56.1%

75.7%

87.9%

Tuesday January 13th, 2015

43W, 3D

0.22%

99.18%

-%

-%

26.8%

57.3%

76.8%

-%

Wednesday January 14th, 2015

43W, 4D

0.18%

99.38%

-%

-%

29%

58.1%

79%

-%

Thursday January 15th, 2015

43W, 5D

0.14%

99.53%

-%

-%

29.8%

59.6%

-%

-%

Friday January 16th, 2015

43W, 6D

0.1%

99.65%

-%

-%

28.6%

62.9%

-%

-%

Saturday January 17th, 2015

44W, 0D

0.08%

99.74%

-%

-%

30.8%

-%

-%

-%

Sunday January 18th, 2015

44W, 1D

0.06%

99.81%

-%

-%

31.6%

-%

-%

-%

Monday January 19th, 2015

44W, 2D

0.04%

99.87%

-%

-%

30.8%

-%

-%

-%

Probability of labor on a given day

Probability of labor by a given day

Notes and disclaimers

All percentages are estimates based on mathematical averages and should not be taken terribly seriously... just because you only have 5% chance of going into labor two weeks early, that doesn't mean you should schedule a trip to the bahamas that weekend (see xkcd to get what I mean here).

You should (obviously) listen to your doctor or midwife on all matters related to pregnancy and childbirth. Just because this chart tells you that a 42W pregnant woman has a high chance of delivering in the next seven days, it doesn't mean it's healthy for her to be pregnant for seven more days. If your doctor wants to increase probability of delivery by inducing labor, there's probably a good reason.

Finding good distribution statistics on spontaneous labor is interesting. I have not found a study with an exact daily breakdown of when babies are born. However I have read way too much on this topic, so I can tell you that my favorite published research is The length of human pregnancy as calculated by ultrasonographic measurement of the fetal biparietal diameter (H. Kieler, O. Axelsson, S. Nilsson, U. Waldenströ) which a very nice table of 10 published studies, which found various means between 272-283 days. The study contributes their own results as well, analyzing nearly 2000 mothers who went into labor spontaneously, and there's graphs of what they found. They found a mean around 280 days, and standard deviations between 8-11 days. There's a big list of other studies and answers in the Introduction to my due date survey results.

Which leads to this topic... I am also in the process of collecting my own statistics. If you have had a baby, please take my due date survey. Oddly enough, the numbers I've collected so far support my messy hunch that pregnancy length has a 40-week mean and 9-10 day standard deviation. So go me.

Anyway if you have better research, drop me an e-mail (spacefem@spacefem.com).

I am/was a bilingual kid. I am now a bilingual (in another language though) adult. My mother is Dutch and I was born in England so I grew up speaking and understanding English and Dutch. I don't believe I had any problems up until my first day at school when apparently I came home saying "I don't want to speak that funny language any more!" and since my mother was told my doctors and teachers to only speak one language to your kid, I ended up forgetting it all.

Later on (when I was 11) we ended up moving to a Dutch speaking country and even though I was immersed in school I had to learn it all over again. Funnily enough, after about 7 months something clicked and the language started to come back.

Next problem was then we moved to Germany and even though the languages are similar, they are not the same. It took me about three years (immersed again) while learning German too for something to click and I started to also dream in German.

My Dutch teacher in the Dutch country had a grandson who spoke 4 languages fluently at the age of 6. He could differentiate between them too.

My boobs are small, and this is important for a couple of reasons: At any one time I can only produce a max of about 6 oz.
Actually, the physical size of your boobs doesn't have much to do with how much you produce. There are lots of small-breasted women who produce a lot and lots of large-breasted women who don't. It's mostly genetic and some other variables thrown in (e.g. if there was a lot of BPA in your mom when you were in utero can affect it, we're finding out).

You don't have to post at all if you don't want to! But we're here to offer support if you do want to.

I have very little time sans baby anymore
This does get a little better over time, when they're a little more autonomous. Though I still long for the day when I can just freaking go to the bathroom all by myself. (I seriously spent like 20 minutes in the bathroom the other day while the hubby was watching the kid @ a birthday party, just for that reason. I mean how sad does that sound?)

I know he requires more alone time than I do, and I know he isn't getting any more than I am.
Any chance of arranging a tag-team schedule?

A Beautiful article by writer Kathryn McDowell recently I read liked to share with you

Why Pocket Diapers Are Better Than Disposables :

As a young parent, you've no doubt heard of pocket diapers. Perhaps a neighbor or a co-worker told you about them. Or it was your babysitter, who asked you to get them soon. Well, so many families in America are today turning to pocket diapers for their little ones. But a majority still holds on to disposable diapers, while being curious about pocket diapers at the same time.

Why are diapers so great? For a start, pocket diapers come with brand new fabrics and super absorbent pads, are easy to put on, simple to take off, easy to wash and quick to dry. And they are better than disposable diapers.

They are Cheaper
Until your child is potty trained, you'd probably spend something close to $2500 to $3000 on diapers - which is quite a lot. Biodegradable disposable diapers are even costlier. But with pocket ones, you won't have to spend anything more than $350 to $400, till your child is potty trained.

Some of my family members who work in the healthcare system have overheard some doozies.

I work in healthcare, so I can relate. I think my favourite was a kid called "Abcde" which we were assured was pronounced "Abasidee". Mirena was a cute choice, named after the contraceptive device. Then there have been some good narrative names including places of birth - e.g. "Shell" (after the baby born in a petrol station carpark) - and places of conception - e.g. "...(a suburb which I'll keep secret - just in case this somehow breaches some poor kid's privacy) bus stop."

I'm pretty infuriated that in Canada it can cost $1,676/month for daycare, when science actually tells us we evolved to help each other raise children. I wrote a blog about this in case anyone is interested! I would really like to see this change for mothers all over Canada.

First 2 were on purpose, 3rd kinda not so much, 4th was totally an oops (when you think things are broken, they have this habit of fixing themselves). Made sure we were done after that. Aside from that, we knew we'd have at least 2, likely 3, but the timing was not at all what we thought we were "planning". Such is life.

It's alright to discuss these topics, but there needs to be boundaries. I would use the following, personally:

1. Don't insert yourself into a stranger's situation or bring up the topic yourself to a stranger.
2. It's probably not your business if you're not a parent yourself.
3. Ask the person why they are making these choices, don't assume.
4. Try to end on a positive note.

I don't feel right bringing up to my sister that I don't agree that she spanks my nephew, but after being a teacher, I am pretty forgiving of parents' choices. It's the hardest role there is. Even though I want to raise my children on nutritious meals, cloth diapers, and museum passes, I know I'm going to slip up and give them fries, Huggies, and Disney DVD's.

I also feel that home birth is a fine option for low-risk births, where the mother is well coached and the midwife is reputable. If you live near a hospital and your midwife is highly qualified, why not? They have equipment. I won't be choosing this option, but with any birth plan there needs to be a series of precautions taken.